更新时间：2022-09-29 GMT+08:00
RegionServer实例异常，处于Restoring状态
问题背景
HBase启动失败，RegionServer一直处于Restoring状态。
原因分析
查看异常的RegionServer实例的运行日志（/var/log/Bigdata/hbase/rs/hbase-omm-XXX.log），发现显示以下打印信息ClockOutOfSyncException...，Reported time is too far out of sync with master
2017-09-18 11:16:23,636 | FATAL | regionserver21302 | Master rejected startup because clock is out of sync | org.apache.hadoop.hbase.regionserver.HRegionServer.reportForDuty(HRegionServer.java:2059) org.apache.hadoop.hbase.ClockOutOfSyncException: org.apache.hadoop.hbase.ClockOutOfSyncException: Server nl-bi-fi-datanode-24-65,21302,1505726180086 has been rejected; Reported time is too far out of sync with master. Time difference of 152109ms > max allowed of 30000ms at org.apache.hadoop.hbase.master.ServerManager.checkClockSkew(ServerManager.java:354) ... ... 2017-09-18 11:16:23,858 | ERROR | main | Region server exiting | org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.start(HRegionServerCommandLine.java:70) java.lang.RuntimeException: HRegionServer Aborted
该日志说明异常的RegionServer实例和HMaster实例的时差大于允许的时差值30s（由参数hbase.regionserver.maxclockskew控制，默认30000ms），导致RegionServer实例异常。
解决办法
调整异常节点时间，确保节点间时差小于30s。
父主题： 使用HBase
